Nagato

Nagato (長門), better known as Pain (ペイン, Pein), was the recognized leader of Akatsuki and Amegakure and was a major antagonist in the series. Referred to as "Leader" by all Akatsuki members, except for Konan, he directed the actions of the rest of the members and maintained authority over them. However, he had secretly collaborated with Madara Uchiha.